Helmet is sized for a normal human head. adjustment probably needed. If the helmet is too wobbly on your head, you can pad the inside with foam like I did.

I printed this helmet with 0,2 layer height.

Supports are needed

My finished helmet weighs 1,2 kg

The horns are hollow because I put LEDs into them and they are printed with transparent filament.

I made the horns detachable, so it can be transported easier. to make them more snug, i put a thin 2mm foam sheet around the hole of the horn